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Reports instantiation of utility classes using the <code>new</code> keyword.
<p>
  In utility classes, all fields and methods are <code>static</code>.
  Instantiation of such classes is most likely unnecessary and indicates a mistake.</p>
<p><b>Example:</b></p>
<pre><code>
  class MyUtils {
    public static double cube(double x) {
      return x * x * x;
    }
  }
  class Main {
    public static void main(String[] args) {
      // Instantiation of utility class
      MyUtils utils = new MyUtils();
    }
  }
</code></pre>
<p>
  To prevent utility classes from being instantiated,
  it's recommended to use a <code>private</code> constructor.
</p>
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